(217em) Synthesis and Effect of Fuel of Sr Doped CaTiO3 Using By Solution Combustion Synthesis (SCS)

Perovskite phase in Synroc (synthetic Rock), normally CaTiO₃ is used, is one of the component materials for the disposal of high level radioactive wastes because it can immobilize metal elements by forming solid solutions with them. La and Sr have recognized as elements of HLW immobilized by forming solid dolution with CaTiO₃. For forming solid solution with CaTiO₃, the solution combustion synthesis (SCS) process was applied and the powder characteristics and sinterability were investigated. The proper selection of the type and the composition of fuels are important to get the crystalline solid solution of CaTiO₃. When glycine or the mixtures of urea+citric acid with stoichiometric composition was used, the solid solution of Ca(La, Sr)TiO₃ were entirely produced. The combustion synthesized powder seemed to have a good sinterability with the linear shrinkage of more than 20% up to 1400^oC, while that of the solid state reacted powder was less than 16% at the same conditions.